Cellular Processes in Biology /
Osmosis is the movement of water molecules through a selectively-permeable membrane down a water potential gradient. More specifically, it is the movement of water across a selectively permeable membrane from an area of high water potential (low solute concentration) to an area of low water potentia...
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| Format: | software, multimedia |
| Language: | eng |
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Delhi, India : World Technologies,
2012
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| Online Access: | http://repository.library.utm.my/id/eprint/3930 |
| _version_ | 1796763469555433472 |
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| author | Rhyne, Golden, author 648749 |
| author_facet | Rhyne, Golden, author 648749 |
| author_sort | Rhyne, Golden, author 648749 |
| collection | OCEAN |
| description | Osmosis is the movement of water molecules through a selectively-permeable membrane down a water potential gradient. More specifically, it is the movement of water across a selectively permeable membrane from an area of high water potential (low solute concentration) to an area of low water potential (high solute concentration). It may also be used to describe a physical process in which any solvent moves, without input of energy, across a semipermeable membrane (permeable to the solvent, but not the solute) separating two solutions of different concentrations. Osmosis releases energy, and can be made to do work, but is a passive process, like diffusion. Net movement of solvent is from the less-concentrated (hypotonic) to the more concentrated (hypertonic) solution, which tends to reduce the difference in concentrations. This effect can be countered by increasing the pressure of the hypertonic solution, with respect to the hypotonic. The osmotic pressure is defined to be the pressure required to maintain an equilibrium, with no net movement of solvent. Osmotic pressure is a colligative property, meaning that the osmotic pressure depends on the molar concentration of the solute but not on its identity. Osmosis is important in biological systems, as many biological membranes are semipermeable. In general, these membranes are impermeable to organic solutes with large molecules, such as polysaccharides, while permeable to water and small, uncharged solutes. Permeability may depend on solubility properties, charge, or chemistry, as well as solute size. Water molecules travel through the plasma cell wall, tonoplast (vacuole) or protoplast in two ways, either by diffusing across the phospholipid bilayer directly, or via aquaporins (small transmembrane proteins similar to those in facilitated diffusion and in creating ion channels). Osmosis provides the primary means by which water is transported into and out of cells. The turgor pressure of a cell is largely maintained by osmosis, across the cell membrane, between the cell interior and its relatively hypotonic environment. |
| first_indexed | 2024-03-05T16:56:15Z |
| format | software, multimedia |
| id | KOHA-OAI-TEST:597092 |
| institution | Universiti Teknologi Malaysia - OCEAN |
| language | eng |
| last_indexed | 2024-03-05T16:56:15Z |
| publishDate | 2012 |
| publisher | Delhi, India : World Technologies, |
| record_format | dspace |
| spelling | KOHA-OAI-TEST:5970922023-11-21T00:33:55ZCellular Processes in Biology / Rhyne, Golden, author 648749 software, multimedia Electronic books 631902 Delhi, India : World Technologies,2012©2012engOsmosis is the movement of water molecules through a selectively-permeable membrane down a water potential gradient. More specifically, it is the movement of water across a selectively permeable membrane from an area of high water potential (low solute concentration) to an area of low water potential (high solute concentration). It may also be used to describe a physical process in which any solvent moves, without input of energy, across a semipermeable membrane (permeable to the solvent, but not the solute) separating two solutions of different concentrations. Osmosis releases energy, and can be made to do work, but is a passive process, like diffusion. Net movement of solvent is from the less-concentrated (hypotonic) to the more concentrated (hypertonic) solution, which tends to reduce the difference in concentrations. This effect can be countered by increasing the pressure of the hypertonic solution, with respect to the hypotonic. The osmotic pressure is defined to be the pressure required to maintain an equilibrium, with no net movement of solvent. Osmotic pressure is a colligative property, meaning that the osmotic pressure depends on the molar concentration of the solute but not on its identity. Osmosis is important in biological systems, as many biological membranes are semipermeable. In general, these membranes are impermeable to organic solutes with large molecules, such as polysaccharides, while permeable to water and small, uncharged solutes. Permeability may depend on solubility properties, charge, or chemistry, as well as solute size. Water molecules travel through the plasma cell wall, tonoplast (vacuole) or protoplast in two ways, either by diffusing across the phospholipid bilayer directly, or via aquaporins (small transmembrane proteins similar to those in facilitated diffusion and in creating ion channels). Osmosis provides the primary means by which water is transported into and out of cells. The turgor pressure of a cell is largely maintained by osmosis, across the cell membrane, between the cell interior and its relatively hypotonic environment.Chapter 1. Osmosis -- Chapter 2. Passive Transport and Active Transport -- Chapter 3. Phagocytosis -- Chapter 4. Programmed Cell Death -- Chapter 5. Apoptosis -- Chapter 6. Autophagy -- Chapter 7. Cell Signaling -- Chapter 8. Cell Migration -- Chapter 9. Transcription (Genetics) -- Chapter 10. DNA Repair -- Chapter 11. Senescence and Cell Adhesion.Osmosis is the movement of water molecules through a selectively-permeable membrane down a water potential gradient. More specifically, it is the movement of water across a selectively permeable membrane from an area of high water potential (low solute concentration) to an area of low water potential (high solute concentration). It may also be used to describe a physical process in which any solvent moves, without input of energy, across a semipermeable membrane (permeable to the solvent, but not the solute) separating two solutions of different concentrations. Osmosis releases energy, and can be made to do work, but is a passive process, like diffusion. Net movement of solvent is from the less-concentrated (hypotonic) to the more concentrated (hypertonic) solution, which tends to reduce the difference in concentrations. This effect can be countered by increasing the pressure of the hypertonic solution, with respect to the hypotonic. The osmotic pressure is defined to be the pressure required to maintain an equilibrium, with no net movement of solvent. Osmotic pressure is a colligative property, meaning that the osmotic pressure depends on the molar concentration of the solute but not on its identity. Osmosis is important in biological systems, as many biological membranes are semipermeable. In general, these membranes are impermeable to organic solutes with large molecules, such as polysaccharides, while permeable to water and small, uncharged solutes. Permeability may depend on solubility properties, charge, or chemistry, as well as solute size. Water molecules travel through the plasma cell wall, tonoplast (vacuole) or protoplast in two ways, either by diffusing across the phospholipid bilayer directly, or via aquaporins (small transmembrane proteins similar to those in facilitated diffusion and in creating ion channels). Osmosis provides the primary means by which water is transported into and out of cells. The turgor pressure of a cell is largely maintained by osmosis, across the cell membrane, between the cell interior and its relatively hypotonic environment.Biologyhttp://repository.library.utm.my/id/eprint/3930URN:ISBN:9788132331384Remote access restricted to users with a valid UTM ID via VPN. |
| spellingShingle | Biology Rhyne, Golden, author 648749 Cellular Processes in Biology / |
| title | Cellular Processes in Biology / |
| title_full | Cellular Processes in Biology / |
| title_fullStr | Cellular Processes in Biology / |
| title_full_unstemmed | Cellular Processes in Biology / |
| title_short | Cellular Processes in Biology / |
| title_sort | cellular processes in biology |
| topic | Biology |
| url | http://repository.library.utm.my/id/eprint/3930 |
| work_keys_str_mv | AT rhynegoldenauthor648749 cellularprocessesinbiology |